"I haven't been dwelling on what happened at the Open at all, I put that out of my head in the week afterwards.
"I had to, otherwise you'd never come back to a golf course, would you? It's kind of painful. I'd been working hard and I hadn't quite got back in that position until today, but I felt good out there.
"I just had to trust that all the work that I'd put into my game was going to hold up and to not get in my own way is the big thing.
"Not (to) have thoughts of what happened at the Open or any other negative thoughts come into play -- that's just part of the mental side of this game."
The last of Sunday's winner was 28-year-old Stenson, who held off the late challenge of George Coetzee to end a five-year run without a European Tour victory.
He also secured his place at next week's World Tour Championship in Dubai after closing the tournament on 17-under, despite a blip half way through his round when he fell back to level pegging with his South African challenger.
"It was great that I came down here," he told the European Tour website. "One of the bigger reasons was I was 59th in The Race to Dubai standings and I needed a good week.
"I made it difficult for myself in the middle of the round there but hung in there and stayed patient. I played well to shoot 17 under par around here in these windy conditions. It was playing a lot harder today."